Method for compensating a phase delay of a clock signal

A method, for use in a data communications system having a semiconductor device and a storage device coupled thereto via a bus, for compensating a phase delay of a clock signal coupled to the devices, the method comprising the steps of:

• (a) providing a plurality of delayed clock signals with different delay amounts by modifying the amounts of delay of the clock signal;
• (b) in synchronization with a delayed clock signal selected among the delayed clock signals, sequentially issuing and sending, at a controller, one or more test data signals and address signals thereof to the storage device via the bus;
• (c) in synchronization with the original clock signal, at the storage device, storing each of the one or more test data signals in an area that its address signal indicates and, thereafter, upon receipt of the address signal at a predetermined time of the original clock signal, reading and sending a data signal which corresponds to the address signal to the controller via the bus;
• (d) at a predetermined time of the delayed clock signal, receiving, at the controller, a data signal from the storage device and checking as to whether or not said each test data signal and the received data signal are the same;
• (e) if it is checked to be positive with respect to said each test data signal at said step (d), repeating said steps (b) to (d) for a next test data signal and, if otherwise, repeating said steps (b) to (d) for a next selected delayed clock signal until it becomes checked to be positive;
• and
• (f) if it is checked to be positive with respect to all the one or more test data signals at said step (e), determining the delayed clock signal as a definitive clock signal to be used in the semiconductor device, and, if otherwise, repeating the steps (b) to (e) for a next selected delayed clock signal until it becomes checked to be positive.